The PMA2130 is a portable illumination
detector (Lux detector) with spectral response following the CIE photopic action spectrum.
This detector is designed to have a spectral response like that of the human eye’s
visual response in the photopic region. The human eye has three distinctive regions of response. The first region is the response of the eye under typical lighting conditions (photopic) defined as intensities greater than about 0.1 Lux. The second region is a transitional region known as the Purkinje region defined as intensities between about 0.01 and 0.1 Lux. The third region is the dark adapted region of the human eye (scotopic) defined as intensities between about 0.01 and 0.0001 Lux. Intensities less than 0.0001 Lux are undetectable with the human eye. These three regions are distinctive in that the human eye has different spectral response for each region of intensity. The photopic spectral luminous efficiency curve peaks at 555nm and it is normalized to 1 at that wavelength.
The power-like unit of brightness-sensation-producing ability of light is Lumen [lm]. The relationship between effective Watts and Lumen has changed several times during 20th century and it is now assumed to be 683 lm/W. For example, 555-nm monochromatic radiation flux of 1W would carry the luminous flux of 1 lm. Please note, that scotopic spectral luminous efficiency as well as the conversion factor between Watts and scotopic lumens differ from their photopic counterparts.
The illumination (illuminance) is measured in luminous flux per unit area. The following units are commonly used:
1 lumen/cm2 = 1 phot (ph)
1 lumen/ft2 = 1 foot-candle (ft-cd)
1 lumen/m2 = 1 lux (lx)
with ft-cd and lux dominating in the field.
The PMA2130 detector has a Teflon diffuser assuring an angular response close to the cosine function (Lambertian response). It is of particular importance when measuring radiation flux from extended sources or from sources positioned at an angle to the axis of the detector.
FEATURES
- High sensitivity
- Wide dynamic range
- Excellent long term stability
- Cosine corrected
- NIST traceable calibration
- Selectable units
APPLICATIONS
- Environmental monitoring
- Industrial and laboratory safety
- Industrial and residential lighting
- Art and museum maintenance
- Photography and film studios
- Clinical studies
